Lots of users have the impression this will never cause a problem because of the high speed signal characteristics of DP cable (even if the impedance is not correct), but there are other factors that could MAKE it very unstable

• There will be too much voltage loss at the end of the cable because of the higher loop resistance of standard DP cable (110 Ohm/km). PA cable has a loop resistance of 44 Ohm/km. When it is an Ex coupler with only 12.xV output, there is a CHANGE the last devices “get lost” all the time”.
• The DP cable gets over-powered because of its “thin” 0.64 mm diameter wires. PA cable wires have a diameter between 0.8 to 1.5 mm.
• PA COUPLING components cannot handle the “thin” wires of the DP cable.
• When it is an Ex installation, the DP cable is probably not blue and not suitable for the FISCO Ex specs.

Our advice is to use only cable that COMPLIES with the PA SPECIFICATIONS.

Lots of users have the impression this will never cause a problem because of the high speed signal characteristics of DP cable (even if the impedance is not correct), but there are other factors that could make it very unstable

Our advice is to use only cable that complies with the PA specifications.